From: Anton Blanchard <anton@samba.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] Enable hashdist by default on PowerPC
Date: Wed, 18 Feb 2009 17:20:05 +1100 [thread overview]
Message-ID: <20090218062005.GB32195@kryten> (raw)
In-Reply-To: <1234935667.14060.440.camel@pasglop>
Hi Ben,
> You have numbers ? :-) I'm asking mostly because I've been wondering
> whether it offsets the 16M pages vs. 4K or 64K pages in term of TLB/ERAT
> impact.
The speedup is application dependent. Things like linpack usually
improve when you throw more memmory at them.
The potential slowdown will be in heavy dcache use (eg fileserving). We
originally added the large boot time hash code when we were benchmarking
SPECsfs (an NFS benchmark).
We can go back to the old behaviour with the hashdist=0 boot option, so
it's mostly a question of what the default should be.
Anton
next prev parent reply other threads:[~2009-02-18 6:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-18 5:11 [PATCH] Enable hashdist by default on PowerPC Anton Blanchard
2009-02-18 5:41 ` Benjamin Herrenschmidt
2009-02-18 6:20 ` Anton Blanchard [this message]
2009-02-18 9:19 ` David Miller
2009-02-20 5:19 ` Anton Blanchard
2009-02-20 8:03 ` David Miller
2009-02-26 11:24 ` [PATCH] Enable hashdist by default on 64bit NUMA Anton Blanchard
2009-02-26 11:34 ` David Miller
2009-03-03 5:27 ` Benjamin Herrenschmidt
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